stunnel-users

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6 participants
3294 discussions

https to https proxy
by Daniel Trickett 19 Aug '19

19 Aug '19

Hi, Our punchout vendor switched their site to only accept tls 1.2 over the weekend. Unfortunately our application will only support SSL. We are using stunnel with other vendors but can control the inbound host name. This recent one is one we can't manage as it is the software provider. I found a solution for doing https to https. I'm unclear how I get the first https traffic to route to stunnel as the initial call will be from the application will be to the external host.. Any thoughts on whether this would work for my situation? Appreciate any thoughts.. [Tunnel_in] client = yes accept = host_ip:443 connect = localhost:54321 [Tunnel_out] client = no accept = localhost:54321 connect = externalhostname:443 Best regards, Dan

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Working OCSP example instructions?
by Mark Currie 24 Jul '19

24 Jul '19

Hi, Does anyone have a link to detailed instructions of a working example of Stunnel with OCSP? (including certificate creation if possible) I came across one some time back but can no longer find it. I would greatly appreciate any help with this. I wasn't able to get any replies to my earlier posting showing my problem: https://www.stunnel.org/pipermail/stunnel-users/2019-July/006451.html

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Is there a latest version Debian stunnel package?
by Miranda Zhang 23 Jul '19

23 Jul '19

Hi everyone, I can only find stunnel4 Debian package: https://packages.debian.org/search?keywords=stunnel https://debian.pkgs.org/10/debian-main-amd64/stunnel4_5.50-3_amd64.deb.html ftp://ftp.stunnel.org/stunnel/archive/5.x/stunnel4_5.28-0ubuntu1_amd64.deb <ftp://ftp.stunnel.org/stunnel/archive/5.x/> Is there a 5.55 package? Thanks, Miranda

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Multiple certificates with same hash
by Marco Göbel 23 Jul '19

23 Jul '19

Hi, we use c_rehash to upgrade client certificates and we have multiple certificates with the same hash (e.g. same subject but different start-/end validity) like: ee98f073.0 ee98f073.1 ee98f073.2 The man-page description for the CApath option seems to be correct what stunnel will do: >Note that the certificates in this directory should be named XXXXXXXX.0 >where XXXXXXXX is the hash value of the DER encoded subject of the cert. It seems only certificates with the ending .0 is used by stunnel and the others certificate hashes with higher numbers are never used/read. Can you confirm? Any idea how to use all certificates with stunnel? BTW. we tested with version 4.56 and latest 5.5 Regards, Marco

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Multi-Mode-Stunnel
by MESSINGSCHLAGER Andreas 17 Jul '19

17 Jul '19

Is it possible to run stunnel in the server-mode und in the client-mode on the same server? ------------------------------------------------------ ADG Apotheken-Dienstleistungsgesellschaft mbH Salzachstrasse 15 D-68199 Mannheim ADG ist Gesamt-Sieger der "markt intern" Umfragen "Apotheken - Software 2009, 2011, 2013, 2016 & 2018". Sitz: Mannheim Registergericht: Amtsgericht Mannheim HRB 701436 USt.-IdNr.: DE132763561 Geschaeftsfuehrer: Joachim von Morstein, Bernd Hess, Dr. Max Schwesig Diese E-Mail und alle Anhaenge enthalten vertrauliche und rechtlich geschuetzte Informationen, die ausschliesslich fuer den Gebrauch des Adressaten bestimmt sind. Das unerlaubte Kopieren, die unbefugte Weitergabe oder sonstiger ungenehmigter Gebrauch der E-Mail nebst den Anhaengen sind nicht gestattet. Sollten Sie nicht der richtige Adressat sein oder die E-Mail irrtuemlich erhalten haben, informieren Sie bitte den Absender unverzueglich telefonisch oder per E-Mail und vernichten diese E-Mail und alle Anhaenge sowie etwaige Kopien und Sicherungskopien. Vielen Dank. This e-mail message and all attachments transmitted with it may contain legally privileged and confidential information intended solely for the use of the addressee. If you are not the intended recipient or have received this e-mail in error, you are hereby notified that any dissemination, distribution, copying, or other use of this message or its attachments is strictly prohibited. If you have received this message in error, please notify the sender immediately by telephone or by electronic mail, and delete this message and all copies and backups thereof. Thank you. ------------------------------------------------------

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feature ? authorizing only given certificates ?
by fmgre-dell＠yahoo.fr 15 Jul '19

15 Jul '19

Hello My european organization is using a certificate chain which signs tens of thousands of user certificates. My local organization counts 300 users ... and i only want these 300 to get in the IT system. I'd like to know if there is a way to restrict the connection to a subset of certificates ( for example based on a list of authorized emails which are written in the certificate ) Sincerely Fred

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Possible to verify client certificate BUT ignore expiration-date?
by Brent Kimberley 11 Jul '19

11 Jul '19

Would libfaketime or run_as_date help? Date: Thu, 11 Jul 2019 10:48:39 -0400 From: Christopher Schultz <chris(a)christopherschultz.net> To: stunnel-users(a)stunnel.org Subject: Re: [stunnel-users] Possible to verify client certificate BUT ignore expiration-date? Eric, (Coming back to this.) On 5/14/19 14:41, Eric Eberhard wrote: > Chris, > > There are "real" certificates you purchase from a certificate authority and pay an annual fee. If this is https you pretty much need that or the user gets errors. By private I meant "self signed." > > However, openssl has an option to create a certificate. You type the name, address, whatever, and it makes a certificate. It is JUST AS GOOD as a purchased certificate (except https or perhaps others that want certificate authority certificates). I use them for FTP and SSH and many things . > > openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 > > You can put your own expire date(days) when you make the cert. A screen will come up and ask 20 questions :-) If you cannot do it (don't have openssl installed) I can do it for you. It certainly will work as a stop-gap. We don't need it for https as it is Apache on a machine that is hosted. So... everything above is exactly what we do with this vendor. We don't have a problem getting a well-known-CA to sign the certificate. We have (had) a problem with the vendor just getting the damned work done. Yes, I know it is a 5-minute process but when you are dealing with a big company where you have to have 6 managers in multiple time zones call each other to confirm the problem, have a meeting about the solution, determine a course of action, allocate a resource to perform the work, QA the solution, then get an IT review of everything before placing something into production, that 5-minute fix can take days or weeks. I just wanted to say "I still trust this certificate, even though it has expired." Is that possible to do without recompiling stunnel? Thanks, -chris

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Re: [stunnel-users] Possible to verify client certificate BUT ignore expiration-date?
by Christopher Schultz 11 Jul '19

11 Jul '19

Eric, (Coming back to this.) On 5/14/19 14:41, Eric Eberhard wrote: > Chris, > > There are "real" certificates you purchase from a certificate authority and pay an annual fee. If this is https you pretty much need that or the user gets errors. By private I meant "self signed." > > However, openssl has an option to create a certificate. You type the name, address, whatever, and it makes a certificate. It is JUST AS GOOD as a purchased certificate (except https or perhaps others that want certificate authority certificates). I use them for FTP and SSH and many things . > > openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 > > You can put your own expire date(days) when you make the cert. A screen will come up and ask 20 questions :-) If you cannot do it (don't have openssl installed) I can do it for you. It certainly will work as a stop-gap. We don't need it for https as it is Apache on a machine that is hosted. So... everything above is exactly what we do with this vendor. We don't have a problem getting a well-known-CA to sign the certificate. We have (had) a problem with the vendor just getting the damned work done. Yes, I know it is a 5-minute process but when you are dealing with a big company where you have to have 6 managers in multiple time zones call each other to confirm the problem, have a meeting about the solution, determine a course of action, allocate a resource to perform the work, QA the solution, then get an IT review of everything before placing something into production, that 5-minute fix can take days or weeks. I just wanted to say "I still trust this certificate, even though it has expired." Is that possible to do without recompiling stunnel? Thanks, -chris > -----Original Message----- > From: stunnel-users [mailto:stunnel-users-bounces@stunnel.org] On Behalf Of Christopher Schultz > Sent: Tuesday, May 14, 2019 6:49 AM > To: stunnel-users(a)stunnel.org > Subject: Re: [stunnel-users] Possible to verify client certificate BUT ignore expiration-date? > > Eric, > > On 5/13/19 18:06, Eric Eberhard wrote: >> Use openssl to make a private cert? > > What is a "private cert"? > > Also, I need to trust an existing certificate... If they can create a new certificate, then I can just trust the new one. I'm looking for a stop-gap measure, here. > > Thanks, > -chris > >> -----Original Message----- >> From: stunnel-users [mailto:stunnel-users-bounces@stunnel.org] On >> Behalf Of Christopher Schultz >> Sent: Monday, May 13, 2019 2:28 PM >> To: stunnel-users(a)stunnel.org >> Subject: [stunnel-users] Possible to verify client certificate BUT ignore expiration-date? >> >> All, >> >> Does anyone know if it is possible to perform all other verification of a client certificate EXCEPT allow the certificate to have expired? >> >> We have a vendor whose certificate has expired, and we want to allow >> their old certificate to work while they chase their tails trying to >> figure out the best way to re-issue a new cert for us. *eyeroll* >> >> Is it possible? >> >> Thanks, >> -chris >> >> >> >> > > >

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OCSP problem - wrong cert validated
by Mark Currie 11 Jul '19

11 Jul '19

Hi, I am having a problem using OCSP with Stunnel. client: stunnel-5.55, server: stunnel-5.49, both using openssl-1.0.2k-fips. When I use the openssl ocsp command it works fine e.g.: openssl ocsp -issuer idca-rootca.pem -CAfile idca-rootca.pem -cert server-cert.pem -url http://10.0.0.166:40040 Response verify OK server-cert.pem: good Wireshark: OCSP request contains the server cert serial number, and OCSP response returns "certStatus: good(0)". However, when I use Stunnel the OCSP lookup fails (Connection reset by peer), and in the Stunnel log I get: LOG3[0]: OCSP: OCSP_basic_verify: ocsp_vfy.c:166: error:27069070:OCSP routines:OCSP_basic_verify:root ca not trusted Wireshark: OCSP request now contains the issuer (idca) instead of the server cert serial number, and the OCSP response returns "certStatus: unknown (2)". I have tried various combinations of cert and CA pem files e.g. server cert on its own, then including idca, then including both idca and rootca. I have also tried all combinations of CA cert, even including all certs in it. I am testing Stunnel using SSH over TLS and here are the configs: Stunnel client config: [ssh] CAfile = idca-rootca.pem cert = client-cert.pem key = client-key.pem accept=40010 connect=10.0.0.166:40010 verifyPeer = yes OCSP = http://10.0.0.166:40040 Stunnel server config: [sshd] CAfile = idca-rootca.pem cert = server-cert.pem key = server-key.pem accept = 10.0.0.166:40010 connect = 22 Appreciate any help with this problem.

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Academic doubt about firewall bypass
by Brent Kimberley 09 Jul '19

09 Jul '19

Which scenario did you have in mind? [HTTP CLIENT] -->[STUNNEL CLIENT]--><whatever>-->[STUNNEL SERVER]-->[HTTP Server] OR[HTTP Client] -->[Forward-proxy client]-> [STUNNEL CLIENT]--> <whatever>-->[STUNNEL SERVER]-->[REVERSE-PROXY server]--><whatever>--> [HTTP SERVER ] From: Hugo Marello <hugo.marello(a)gmail.com> To: stunnel-users(a)stunnel.org Hello guys, I'm new to using stunnel but I find it quite a powerful tool. I'm doing a POC on how we can bypass our firewall even with DPI, and chose to use stunnel for an extra layer of cryptography. You don't have to worry about access to any VM mentioned here. Here is my scenario: [CLIENT BROWSER] -->[STUNNEL CLIENT]-->[FIREWALL]-->[STUNNEL SERVER]-->[REVERSE PROXY]-->[FREE INTERNET] So far I succeeded in getting HTTP working using stunnel CONNECT protocol to the firewall and going all the way through. The problem is when I try to access HTTPS, the connection get set to the stunnel server but it keeps waiting for something. Double checked all the logs, firewall can't discern, stunnel server get the connection, reverse proxy also get the socket connection. My hypothesis is that stunnel client gets the CONNECT from the browser and discard it, it uses its own way to connect to the firewall, instead of encrypting the CONNECT all the way through. As it may seems, I need a way to send 2 CONNECT packages. Does anyone know how can I proceed? Follow my configs: client = yes output = /var/log/stunnel4/stunnel.log debug = 7 [bypassclient] accept = 4000 connect = firewall.example:3128 protocolHost = destination.com:443 protocol = connect requireCert = no verifyChain = no verifyPeer = no -------------------------------------------------------------------------------------------------------------------- [bypassserver] accept = 0.0.0.0:443 connect = reverseproxy.com:8888 cert = /etc/ssl/cert.pem key = /etc/ssl/key.pem ----------------------------------------------------------------------------------------------------------------------- Thank you all in advance, already digging throw the source code (quite lost tough), Hugo

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